Slide gate for containers holding liquid metal melt

Abstract

An improvement in a slide gate for a container holding molten metal comprising a slide housing and refractory bodies made of a refractory composition, which refractory bodies have been impregnated with carbon-containing media, the improvement residing in employing as the carbon-containing medium an oil containing less than 10% by weight pitch.

What is claimed is: 
     
       1. In a slide gate for a container for holding molten metal comprising a slide housing and refractory bodies made of a refractory composition which refractory bodies have been impregnated with a carbon-containing medium, the improvement wherein said refractory body is impregnated with an impregnant consisting essentially of oil which oil is a carbon-containing medium and contains less than 10% by weight pitch. 
     
     
       2. A gate according to claim 1, wherein said refractory bodies are impregnated with 5 to 20 volume percent oil. 
     
     
       3. A gate according to claim 2, wherein said refractory composition of said refractory bodies is comprised of 80 to 95% by weight Al 2  O 3 , based upon 100% by weight of the refractory composition free of said oil. 
     
     
       4. A gate according to claim 3, wherein said refractory composition of said refractory bodies comprises 80 to 95% by weight of Al 2  O 3     4.5 to 18.5% by weight of SiO 2     0 to 0.5% by weight of Fe 2  O 3     0 to 0.3% by weight of Na 2  O based upon 100% by weight of said refractory composition free of said oil.     
     
     
       5. A gate according to claim 1, where said oil has a coking residue according to Conradson of less than 5% by weight. 
     
     
       6. A gate according to claim 1, wherein said oil has a coking residue according to Conradson of less than 2% by weight.